Before moving here I always stayed at the Majestic, it was my go to hotel especially so close to Nana. I did stay one time at the Dynasty as the Majestic was full. The price was a little more per night and to be honest the facilities and service were pretty much the same. I don't think you could go wrong whatever hotel you choose.
The senior concierge at the Majestic use to be able to get Uni girls or as they are called here Dek sideline girls. They were always outstanding, stunning, early 20's and so much different to the normal bar girls. They were however came at a premium of 4,000baht for short time.